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#1 |
Registered User
Join Date: May 2000
Location: Yorktown, VA, USA
Posts: 71
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I'm trying to buy new pistons for the 427 I'm building to replace my 402...only problem is the heads I'm gonna use are STILL ON the original motor <doh>. I need to know what type of heads I have to get the proper compression ratio with the new piston. The heads are 1970 402 heads from a 1/2 ton GMC pickup. Does anyone know if these original heads are open/closed and what size combustion chambers they have?? If one of you experts knows the answer off the top of your head, it would be much quicker than pulling a head off and trying to find the casting number...
Mega-thanks!! JB ![]()
__________________
//JimmyBum// `70 1/2T LWB GMC Sierra Grande; 402BB/TH400 `72 1/2T LWB GMC Sierra; 402BB/TH400 `88 Lincoln Mark VII LSC |
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